Re: [PATCH v4 2/2] libceph: convert timeouts to secs_to_jiffies()

[Alex Elder <elder@ieee.org>]

On 2/28/25 10:22 PM, Easwar Hariharan wrote:
> Commit b35108a51cf7 ("jiffies: Define secs_to_jiffies()") introduced
> secs_to_jiffies().  As the value here is a multiple of 1000, use
> secs_to_jiffies() instead of msecs_to_jiffies() to avoid the multiplication
> 
> This is converted using scripts/coccinelle/misc/secs_to_jiffies.cocci with
> the following Coccinelle rules:
> 
> @depends on patch@ expression E; @@
> 
> -msecs_to_jiffies(E * 1000)
> +secs_to_jiffies(E)
> 
> @depends on patch@ expression E; @@
> 
> -msecs_to_jiffies(E * MSEC_PER_SEC)
> +secs_to_jiffies(E)
> 
> Change the checks for range to check against HZ.
> 
> Acked-by: Ilya Dryomov <idryomov@gmail.com>
> Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>

Much of this is fine, but I have the same comment on the changes
where you bring HZ into the checks, which is wrong.  Just
convert the code more directly, factoring out 1000 *only*.

> ---
>   include/linux/ceph/libceph.h | 12 ++++++------
>   net/ceph/ceph_common.c       | 18 ++++++++----------
>   net/ceph/osd_client.c        |  3 +--
>   3 files changed, 15 insertions(+), 18 deletions(-)
> 
> diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
> index 733e7f93db66a7a29a4a8eba97e9ebf2c49da1f9..5f57128ef0c7d018341c15cc59288aa47edec646 100644
> --- a/include/linux/ceph/libceph.h
> +++ b/include/linux/ceph/libceph.h
> @@ -72,15 +72,15 @@ struct ceph_options {
>   /*
>    * defaults
>    */
> -#define CEPH_MOUNT_TIMEOUT_DEFAULT	msecs_to_jiffies(60 * 1000)
> -#define CEPH_OSD_KEEPALIVE_DEFAULT	msecs_to_jiffies(5 * 1000)
> -#define CEPH_OSD_IDLE_TTL_DEFAULT	msecs_to_jiffies(60 * 1000)
> +#define CEPH_MOUNT_TIMEOUT_DEFAULT	secs_to_jiffies(60)
> +#define CEPH_OSD_KEEPALIVE_DEFAULT	secs_to_jiffies(5)
> +#define CEPH_OSD_IDLE_TTL_DEFAULT	secs_to_jiffies(60)
>   #define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0  /* no timeout */
>   #define CEPH_READ_FROM_REPLICA_DEFAULT	0  /* read from primary */
>   
> -#define CEPH_MONC_HUNT_INTERVAL		msecs_to_jiffies(3 * 1000)
> -#define CEPH_MONC_PING_INTERVAL		msecs_to_jiffies(10 * 1000)
> -#define CEPH_MONC_PING_TIMEOUT		msecs_to_jiffies(30 * 1000)
> +#define CEPH_MONC_HUNT_INTERVAL		secs_to_jiffies(3)
> +#define CEPH_MONC_PING_INTERVAL		secs_to_jiffies(10)
> +#define CEPH_MONC_PING_TIMEOUT		secs_to_jiffies(30)
>   #define CEPH_MONC_HUNT_BACKOFF		2
>   #define CEPH_MONC_HUNT_MAX_MULT		10
>   
> diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
> index 4c6441536d55b6323f4b9d93b5d4837cd4ec880c..ee701b39960e1c9778db91936ac7503467ee1162 100644
> --- a/net/ceph/ceph_common.c
> +++ b/net/ceph/ceph_common.c
> @@ -527,29 +527,27 @@ int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,
>   
>   	case Opt_osdkeepalivetimeout:
>   		/* 0 isn't well defined right now, reject it */
> -		if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
> +		if (result.uint_32 < 1 || result.uint32 > INT_MAX / HZ)

		if (!result.uint32 || result.uint32 > INT_MAX)

>   			goto out_of_range;
> -		opt->osd_keepalive_timeout =
> -		    msecs_to_jiffies(result.uint_32 * 1000);
> +		opt->osd_keepalive_timeout = secs_to_jiffies(result.uint_32);
>   		break;
>   	case Opt_osd_idle_ttl:
>   		/* 0 isn't well defined right now, reject it */
> -		if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
> +		if (result.uint_32 < 1 || result.uint32 > INT_MAX / HZ)

		if (!result.uint32 || result.uint32 > INT_MAX)

>   			goto out_of_range;
> -		opt->osd_idle_ttl = msecs_to_jiffies(result.uint_32 * 1000);
> +		opt->osd_idle_ttl = secs_to_jiffies(result.uint_32);
>   		break;
>   	case Opt_mount_timeout:
>   		/* 0 is "wait forever" (i.e. infinite timeout) */
> -		if (result.uint_32 > INT_MAX / 1000)

And so on.

					-Alex

> +		if (result.uint32 > INT_MAX / HZ)
>   			goto out_of_range;
> -		opt->mount_timeout = msecs_to_jiffies(result.uint_32 * 1000);
> +		opt->mount_timeout = secs_to_jiffies(result.uint_32);
>   		break;
>   	case Opt_osd_request_timeout:
>   		/* 0 is "wait forever" (i.e. infinite timeout) */
> -		if (result.uint_32 > INT_MAX / 1000)
> +		if (result.uint32 > INT_MAX / HZ)
>   			goto out_of_range;
> -		opt->osd_request_timeout =
> -		    msecs_to_jiffies(result.uint_32 * 1000);
> +		opt->osd_request_timeout = secs_to_jiffies(result.uint_32);
>   		break;
>   
>   	case Opt_share:
> diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
> index b24afec241382b60d775dd12a6561fa23a7eca45..ba61a48b4388c2eceb5b7a299906e7f90191dd5d 100644
> --- a/net/ceph/osd_client.c
> +++ b/net/ceph/osd_client.c
> @@ -4989,8 +4989,7 @@ int ceph_osdc_notify(struct ceph_osd_client *osdc,
>   	linger_submit(lreq);
>   	ret = linger_reg_commit_wait(lreq);
>   	if (!ret)
> -		ret = linger_notify_finish_wait(lreq,
> -				 msecs_to_jiffies(2 * timeout * MSEC_PER_SEC));
> +		ret = linger_notify_finish_wait(lreq, secs_to_jiffies(2 * timeout));
>   	else
>   		dout("lreq %p failed to initiate notify %d\n", lreq, ret);
>   
>